GitHub Actions Workflow Improvements

There are some elements in our CI that can be improved:

For example, code-style.yml starts very often in non-code updates. The same for docs.yml for non-docs.

pytorch-version-tests.yml fails to open the issue because of access problem: https://github.com/pytorch/ignite/runs/2157534748?check_suite_focus=true#step:9:8

• code-style
• docs
• unit-tests: https://github.com/pytorch/ignite/pull/1838#issuecomment-804796165

[trsvchn]

@vfdev-5 Absolutely, docs is very tricky, docs is tightly connected with the repo code, its hard to find non-docs related parts, I was thinking about reducing the number of docs “dry runs” on pull_request by excluding docker, some GHA workflow files, tests but I think its minor changes, so let’s keep it as it is

[vfdev-5]

Can you try that on a separate repo to see what it works exactly. For me “first contribution” is the first and only the first writen issue (same for PR).